I haven't hit 12 mpg since I first got the truck and that's been a year. The only thing I can think of that's making y'all's mpg go down is that your still driving a normal speed while towing a trailer, whereis I'm driving round 60 on the interstate if it's with horses, or 65-70 if it's everything else. Now I have yet to hit the 18-19 mark that people say they have been getting, but I haven't gotten below 15 in a looooooonnnnnggggg time. Most of the time, I will gain a couple of tenths on mileage when pulling(I know that's not a hug increase, but considering most people go from 14 in normal town driving to go down to 12 or even to 10 when towing, I'm ecstatic about that gain).

 

tex25025: we actually have a different camper than the one in my avatar. The one shown was a Bigfoot 10.6 and now we have a Bigfoot 9.5. The 10.6 was just too heavy and too much weight on the rear axle (about 8K lbs with the trailer too). The 9.5 is about 1K lbs less weight and more importantly, the weight is more forward, putting weight on the front axle. When I sweighed the new camper I was 53%/47% (weight on rear vs. front) -- by itself, the darn thing feels like a sports-car!

Towing the 3 horse bumper-pull is no problem with the camper, but you can tell if we load it too heavy in the 3rd stall (at the back) as there is a tiny bit of sway. When it's loaded right, you have to remind yourself the horses are back there! We don't use (or need to) any weight distribution...

Back to the mileage topic, some other things to remember are hills and headwinds. We live in hill country so it's rare I can get a fill-up to fill-up measurement just on flat land.

We couldn't be happier with both the truck and our current set up for camping, tho I could see some years down the road stepping up to a diesel pusher motorhome...

 

Thanks for letting me know about how the bumper trailer handled, I only have gooseneck trailers(2 flatbeds and 1 horse trailer). Back to your post about how rare it is to get flat land judgments, it's the same here where I live in mid. tn. now, and when I go to the Texas Hill Country, I'm going up and down, up and down, only time I really see flat land is in Ark. and in northeast Texas. I just can't reason why I'm still able to maintain mileage(when in my dodge I would lose 1 mpg or a little more) and here I don't, unless I just don't go pedal to the metal compared to some. Don't mistake this for complaining, I'm glad I don't lose mpg, I'm just at a lost how I'm not.

 

04, CC, SB, 4X4, 6 spd stick, stock; 16 MPG overall average with 75% highway (70 mph). Gets worse when it drops into the single digits, closer to 14mpg.

 

single digits?

 

My old 250 (see sig) started off at 15 and dropped to 13 and change by around 2,500 miles. For the next 10,000 miles (1 year) it was mostly 3 day a week city driving with light toy loads on the weekends and a slow eroding to the high 12 and a fractions.

I think the drop in mpg was bottoming out when the truck was stolen. Made a slight difference on how heavy my foot was - about 1 mpg.

 

No Mod's, no Way. About 13 +1/-1 or so towing, depends on terrain. As low as 10 in the mountains and high grades, usually 14 on flats. Empty, about 16, once I got 17 for a couple tanks. Anyone bragging on 19+, well, 'nuf said.

 

F250 '06 CC FX4 17 inch rims at 14000 miles average 80/20 Highway/city got 16.8 / Trip from South Carolina to Baton Rouge, LA got 20.3 at 70-75 mph. After oil change at 16600 local mpg dropped to 14.4-15.2, just did oil change and switched to Mobil 1 Full Synth. 5w-40. and used 14 qt. instead of 15qt. (3/4 on dip stick Checkered part) and mpg so far is back at 16.6 SuperChips Tuner on middle setting since begining (Dealer already had it on the truck when I bought it New).

 

I was running 315/75/R16 on my F350 long bed; I was getting 13 City and 16 Hwy. I just put the stock size 265/75/R16 on for the winter. I have not run enough fuel through the truck yet to see if it made a difference yet or not. If it does not make a big difference I will be going back to the 315/75/R16. I did notice a rise of 325 rpm’s with the smaller tires. (yes my truck’s speedometer was calibrated for the big tires and I had Ford recalibrate it for the 265’s.)